Updated 6:11 pm, Thursday, July 30, 2015

Security lines left the doors of Hobby Airport and traced part of the building's perimeter this morning as thousands of departing sorority sisters raised TSA suspicion with large books.

The Delta Sigma Theta Sorority held a convention in Houston this week, with about 13,000 sisters in attendance. On Thursday morning they headed home through Hobby.

"Apparently at the convention there were items they were given, which they had packed in their bags," said airport spokesman Bill Begley. "And as they were going through a check in process prompted a secondary search by the TSA."

That turned into a lot of secondary searches conducted by hand by the Transportation Security Administration. Begley could not say what the item was, and the TSA did not immediately respond to an inquiry.

KHOU reports the suspicious items where thick booklets which apparently resembled explosives when packed in the bags.